On 14/06/2020 15:41, Gary Gregory wrote:
In order to avoid posting the same answer here and on GitHib over and over,
I tried to explain BC here:
https://garygregory.wordpress.com/2020/06/14/how-we-handle-binary-compatibility-at-apache-commons/

Feedback is most welcome.

Gary

You mention that adding fields is fine. That's true for binary compatibility, but it could cause serialization incompatibility. For instance, if you add a primitive field, trying to deserialize an existing blob will set the value to the default value of 0. That could cause code to break. It's why I made the "end" field of CharSequenceReader Integer instead of int; see https://github.com/apache/commons-io/blob/master/src/main/java/org/apache/commons/io/input/CharSequenceReader.java.

Rob

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